#include <stdio.h>
int main ()
{
	double a,b;
	double c,d,e,f,h,i,j,m,n;
	printf("a=");
	scanf("%lf",&a);
	printf("b=");
	scanf("%lf",&b);
	
	c=-a;
	d=-b;
	e=a+b;
	f=a/b;
	h=a>=b;
	i=a>0 && !b!=0;
	j=a>0,b>0;
	m=a*=b;
	n=sizeof(a);
	printf("%lf.\n %lf.\n %lf.\n %lf.\n %lf.\n %lf.\n %lf.\n %lf.\n %lf.\n",c,d,e,f,h,i,j,m,n);
	return 0; 
	
} 
